Unsaturated polyester resin for die pressing and preparation method thereof

A polyester resin and unsaturated technology, applied in the field of unsaturated polyester resin for molding and its preparation, can solve the problems of low heat resistance, poor surface smoothness of products, micro-cracks, etc. The effect of improving the surface finish

Inactive Publication Date: 2011-09-07
宜兴市兴合树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are many unfavorable factors affecting the further development of SMC / BMC products: such as poor surface smoothness of products;

Method used

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  • Unsaturated polyester resin for die pressing and preparation method thereof
  • Unsaturated polyester resin for die pressing and preparation method thereof
  • Unsaturated polyester resin for die pressing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Formula: 150 parts by weight of phthalic anhydride, 290 parts by weight of propylene glycol, 440 parts by weight of maleic anhydride, 99 parts by weight of dipropylene glycol, 40 parts by weight of methylpropanediol, 85 parts by weight of neopentyl glycol, and 420 parts by weight of styrene.

[0035] Preparation:

[0036] a) Take 31% of the weight of propylene glycol, add phthalic anhydride under stirring state, seal it, and heat it to 197° C. for 4-5 hours.

[0037] b) When the acid value of the material reaches 60-65mgKOH / g, cool to 165°C, add the remaining propylene glycol, dipropylene glycol, methyl propylene glycol, and neopentyl glycol under stirring, stop stirring, and then add maleic anhydride; reheat the material When the temperature reaches 140°C, start stirring, heat to effluent for 6 hours, and when the temperature of the material rises to 210°C, keep it warm for 4 hours. When the acid value reaches 60-65mgKOH / g, vacuumize and reduce pressure. When the acid...

Embodiment 2

[0040] Formula: 120 parts by weight of phthalic anhydride, 350 parts by weight of propylene glycol, 470 parts by weight of maleic anhydride, 70 parts by weight of dipropylene glycol, 50 parts by weight of methylpropanediol, 70 parts by weight of neopentyl glycol, and 470 parts by weight of styrene.

[0041] Preparation:

[0042] a) Take 40% of the weight of propylene glycol, add phthalic anhydride in a stirring state, seal it, and heat it to 200° C. for 4 to 5 hours.

[0043] b) When the acid value of the material reaches 60-65mgKOH / g, cool to 170°C, add the remaining propylene glycol, dipropylene glycol, methyl propylene glycol, and neopentyl glycol under stirring, stop stirring, and then add maleic anhydride; reheat the material When the temperature reaches 150°C, start stirring, heat until the water comes out for 5 hours, and when the temperature of the material rises to 205°C, keep it warm for 5 hours. When the acid value reaches 60-65mgKOH / g, vacuumize and reduce pressure. ...

Embodiment 3

[0046] Formula: 145 parts by weight of phthalic anhydride, 317 parts by weight of propylene glycol, 445 parts by weight of maleic anhydride, 98 parts by weight of dipropylene glycol, 40 parts by weight of methylpropanediol, 80 parts by weight of neopentyl glycol, and 435 parts by weight of styrene.

[0047] Preparation:

[0048] a) Take 25% of the weight of propylene glycol, add phthalic anhydride in a stirring state, seal it, and heat it to 192° C. for 4-5 hours.

[0049] b) When the acid value of the material reaches 60-65mgKOH / g, cool to 160°C, add the remaining propylene glycol, dipropylene glycol, methyl propylene glycol, and neopentyl glycol under stirring, stop stirring, and then add maleic anhydride; reheat the material When the temperature reaches 145°C, start stirring, heat until the water comes out for 6 hours, and when the temperature of the material rises to 215°C, keep it warm for 4 hours. When the acid value reaches 60-65 mgKOH / g, vacuumize and reduce pressure. ...

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Abstract

The invention discloses unsaturated polyester resin for die pressing and a preparation method thereof. The resin mainly comprises the following raw materials in part by weight: 120 to 150 parts of phthalic anhydride, 290 to 350 parts of propylene glycol, 440 to 470 parts of maleic anhydride, 70 to 100 parts of dipropylene glycol, 40 to 50 parts of methylpropanediol, 70 to 85 parts of neopentyl glycol and 420 to 470 parts of styrene. Compared with the prior art, the invention has the advantages that: the thermal deformation temperature of the resin is higher than 113 DEG C, the surface finishment of a sheet molding compound / bulk molding compound (SMC / BMC) product taking the product as a substrate can meet the requirement of a class A surface, and the resin is particularly suitable for manufacturing an electric appliance switch, an automobile reflecting lamp, a bumper and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an unsaturated polyester resin for molding and a preparation method thereof. Background technique [0002] Unsaturated polyester resin (Unsaturated Polyester Resins, referred to as UPR) is a linear polymer compound with multifunctional groups. It has polyester chain bonds and unsaturated double bonds on its main chain, and each end of the macromolecular chain With carboxyl and hydroxyl. The biggest advantage of using unsaturated polyester resin is that its diluent (styrene) will undergo copolymerization and crosslinking reaction with the double bonds on the main chain when it is finally used, so the solvent volatilization is less during use, so it belongs to the environment. Protection products are often used as substrates in the field of SMC / BMC products. [0003] BMC bulk molding compound (Bulk molding compound), also known as unsaturated polyester glass fiber rei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/676C08G63/78
Inventor 韩立春潘伯祥陈彬彬
Owner 宜兴市兴合树脂有限公司
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